Intermittent grip device.



C. HESS.

INTERMITTENT GRIP DEVICE. APPLIOATIONQIILED MAY13, 1911.

1,025,088, Patented Apr. 30, 1912.

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C. HESS.

INTERMITTENT GRIP DEVICE.

APPLICATION FILED MAY 13,1911.

Patented Apr. 30, 1912.

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993% I Z m e v aflo'meq COLUMBIA PLANOGRAPH CUqWASHINGTON, n. C.

CLARENCE HESS, 0F UNION, OREGON.

INTERMITTENT GRIP nnvicn.

Specification of Letters Patent.

Patented Apr. 30, 1912.

Application filed. May 13, 1911. Serial No. 626,887.

To all whom it may concern Be it known that I, CLARENCE Hess, a citizenof the United States, residing at Union, in the county of Union andState of Oregon, have invented new and useful Improvements inIntermittent Grip Devices, of which the following is a specification.

This invention relates to intermittent grip devices designed especiallyfor ,use in connection with saw-mill set-works, and particularly tomeans for controlling the feed and locking pawls thereof.

In set-works of ordinary construction the sets of pawls must beseparately retracted to release them from engagement with the ratchetwheel. i

The object of my invention is to provide a means by which both sets ofpawls may be simultaneously thrown out by the foot of the operator,leaving both hands of the operator free to work the receder brake.

A further object of the invention 15 to provide a means for holding thepawls thrown out for any desired period.

The invention consists of the features of construction, combination andarrangement of parts, hereinafter fully described and claimed, referencebeing had to the accompanying drawings, in which:

Figure 1 is a side elevation of the pawl and ratchet mechanism of asaw-mill setworks embodying my invention, showing both sets of pawls innormal position. Fig. 2 is a similar view showing the pawls retracted.Figs. 3 and 4 are horizontal and vertical transverse sectional viewsthrough the device. Fig. 5 is a vertical front to rear section throughthe same. Fig. 6 is a detail view showing the supporting plate andassociated parts. I

Referring to the drawings 1 and 2 designate the front and rear sills ofa saw-mill set-works; 3, a carriage floor; 4, a supporting bracketsarranged in parallel relation between the sills; 5, the shaft of thesawmill set-works; 6, the ratchet wheel thereon; 7, the operating leverpivotally mounted upon the shaft; 8, the adjusting or pull rod forcontrolling the pawls; 9, the front feed pawls pivotally mounted uponthe forked lower end 10 of the lever; and 11, the rear locking pawlspivotally mounted upon a bolt extending between the rear ends of thebrackets 4.

Extending between and suitably secured to the rear ends of the brackets4 is a supporting plate 12, in which are adjustably mounted spacedvertical rods 13, held in adjusted position by nuts 11. The upper endsof these rods are arranged to lie in the path of movement of the arms ofthe forked lower end 10 of the lever, to support said lever when tiltedto the limit of its rearward movement. Also mounted upon the supportingplate at a point between the rods 13 is a bolt 15 having a dependingforked lower end 16, to which the rear end of a segment 17 is pivotallyconnected by a pin or bolt 18. This segment extends through the forkedlower end 10 of the lever and the forked lower end 19 of the pull rodand normally rests at its forward end upon the front sill 1.

The rod 8 is slidably mounted on the lever and normally held down by aspring 20 and is adapted to be moved upwardly against the resistance ofthe spring by means of a controlling chain or the like 21 terminallysecured to the upper ends of the rod and the lever. The fork 19 has apivotal connection with the lower end of the rod and is pivotallyconnected with the front feed pawls 9, so that upon the upward movementof said rod said pawls will be retracted. A pin 22 extends between thearms of the fork 19 and beneath the segment 17 by which on the upwardmotion of the rod the segment will also be elevated, for a purposehereinafter described.

As shown, the rear locking pawls 11 are pivotally connected with therear end of the segment by links 23, and to said segment above the pointof connection of the links therewith is attached a controlling chain 21, which leads rearwardly therefrom and is suitably fastened at its rearor free end to a block or beam 25 fastened to the floor 3. The chain isnormally stretched taut, and is adapted to be depressed by the foot ofthe operator, as illustrated in Fig. 2, so as to swing the segment 17upwardly on its fulcrum 18, whereby the locking pawls will be retracted.In this operation the segment will also engage the lower end of thepullrod or bight of the fork and retract the feed pawls 9. Similarly, itwill be understood that when the pull rod is elevated to retract thefront feed pawls the pin 22 will engage and lift the segment and therebyretract the rear locking pawls.

It will thus be seen from the foregoing description that the operatormay, at any time, retract both sets of pawls simultaneously by hand orfoot power, best suits his convenience, and that by depres sion of thechain 241 to perform this function both hands of the operator will beleft free to work the receder brake. the chain 24? is secured to theblock 25 by the engagement of one of its links with a pin or stud 26 onthe block, so that when desired the chain may be drawn rearwardly totilt the segment and engage with the pin or stud to hold. the pawlsretracted for any desired length of time.

Having thus described the invention, what I claim is:

1. The combination with supporting brackets, a shaft JOUIllZtlGCl 1nsaid brackets,

a ratchet wheel on said shaft, a lever piv oted to the shaft, a springpressed rod carried by the lever, said rod having a pivoted fork at itslower end, a feed pawl pivotally connected with the lever and fork, asegment pivotally supported at its rear end by the brackets andextending between the arms of said pivoted fork, a pin carried by thefork and bearing against the segment, a locking pawl pivotallysupported} by the brackets and pivotally connected with the pivoted endof the segment, and stop devices carried by the bracket to engage thearms of the lever fork to limit the rearward movement of said lever.

Preferablv 2. The combination with a pair of spaced brackets, of a shaftjournaled in said brackets, a ratchet wheel mounted on said shaft, alever having a forked lower end pivota-lly engaging the shaft, a springdepressed pull rod carried by the lever and provided with a pivoted forkat its lower end, a feed pawl pivoted to the lever and fork, asupporting plate carried by the brackets, a segment pivotally connectedat its rear end with said plate and extending through the fork of thelever and the said pivoted fork, a pin carried by the pivoted fork andengaging the segment whereby the segment may be tilted upward on theretractive movement of the rod, a locking pawl pivoted to the plate andpivotally connected with the pivoted end of the segment, stop rodsprojecting upward from the plate and lying in the path of movement ofthe arms of the lever fork, an engaging member, and a chain connected atone end with the pivoted end of the segment and adapted to have itslinks connected with said engaging member.

In testimony whereof I afiix my signature in presence of two witnesses.

CLARENCE HESS.

Witnesses:

H. A. HALL, CLARENCE MILLER.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

